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If tight pants aren't your thing, look for jogger-style pants or the popular harem-style pants that have elastic around the ankles. These pants are stretchy and offer a little extra room, but due to the ankle elastic, they'll stay in place throughout your practice.
Shorts are a popular option for guys, and they're also appropriate for women, especially if you plan to try hot yoga. Just keep in mind, you may want to wear form-fitting spandex shorts or looser shorts with connected tights underneath because some poses require you to position your legs in a way that could leave you uncomfortably uncovered with looser, running-style shorts.
Tops: It's important to wear tops that are fairly form-fitting so your shirt doesn't fly over your head during forward bends. Wicking material is helpful, especially if you tend to sweat a lot or if you plan on attending a hot yoga class.
Because yoga rooms are sometimes kept cool, you may want to bring a light cover up or sweater with you to class. You can wear it until class starts, and if you keep it by your mat, you can put it on before the final savasana.